One way to really do an simple exercise in to lighting is to take an object and a light bulb in a holder next to an object on a table in a totally dark room at night, have you camera on a tripod. Now turn the light on, turn off the lights (camera on auto exposure) in the room now move the light and make notes while taking pictures of how you take pictures. Now leave the light on one position and have a white and silver card move the card around the object at different angles at different locations taking notes, do this with both cards. make good enough note where you can match up the exposure with the shot, now examine your work. You will see how light reflects and how what we call the spectral high lights (reflective properties) are effective by different materials at different angles, now you have a start understanding light.